README.md

Contribution Guides

In the spirit of open source software development, jQuery always encourages community code contribution. To help you get started and before you jump into writing code, be sure to read these important contribution guidelines thoroughly:

Linux/BSD users should use their appropriate package managers to install git and Node.js, or build from source
if you swing that way. Easy-peasy.

How to build your own jQuery

Clone a copy of the main jQuery git repo by running:

git clone git://github.com/jquery/jquery.git

Enter the jquery directory and run the build script:

cd jquery && npm run-script build

The built version of jQuery will be put in the dist/ subdirectory, along with the minified copy and associated map file.

If you want create custom build or help with jQuery development, it would be better to install grunt command line interface as a global package:

npm install -g grunt-cli

Make sure you have grunt installed by testing:

grunt -v

Now by running grunt command, in the jquery directory, you could build full version of jQuery, just like with npm run-script build command:

grunt

There are many other tasks avaliable for jQuery Core:

grunt -help

Modules

Special builds can be created that exclude subsets of jQuery functionality.
This allows for smaller custom builds when the builder is certain that those parts of jQuery are not being used.
For example, an app that only used JSONP for $.ajax() and did not need to calculate offsets or positions of elements could exclude the offset and ajax/xhr modules.

Any module may be excluded except for core, and selector. To exclude a module, pass its path relative to the src folder (without the .js extension).

core/ready: Exclude the ready module if you place your scripts at the end of the body. Any ready callbacks bound with jQuery() will simply be called immediately. However, jQuery(document).ready() will not be a function and .on("ready", ...) or similar will not be triggered.

deferred: Exclude jQuery.Deferred. This also removes jQuery.Callbacks. Note that modules that depend on jQuery.Deferred(AJAX, effects, core/ready) will not be removed and will still expect jQuery.Deferred to be there. Include your own jQuery.Deferred implementation or exclude those modules as well (grunt custom:-deferred,-ajax,-effects,-core/ready).

As a special case, you may also replace Sizzle by using a special flag grunt custom:-sizzle.

sizzle: The Sizzle selector engine. When this module is excluded, it is replaced by a rudimentary selector engine based on the browser's querySelectorAll method that does not support jQuery selector extensions or enhanced semantics. See the selector-native.js file for details.

Note: Excluding Sizzle will also exclude all jQuery selector extensions (such as effects/animatedSelector and css/hiddenVisibleSelectors).

The build process shows a message for each dependent module it excludes or includes.

To create a custom build of the latest stable version, first check out the version:

git pull; git checkout $(git describe --abbrev=0 --tags)

Then, make sure all Node dependencies are installed:

npm install

Create the custom build, use the grunt custom option, listing the modules to be excluded. Examples:

For questions or requests regarding custom builds, please start a thread on the Developing jQuery Core section of the forum. Due to the combinatorics and custom nature of these builds, they are not regularly tested in jQuery's unit test process. The non-Sizzle selector engine currently does not pass unit tests because it is missing too much essential functionality.

Running the Unit Tests

Make sure you have the necessary dependencies:

npm install

Start grunt watch or npm start to auto-build jQuery as you work:

cd jquery && grunt watch

Run the unit tests with a local server that supports PHP. Ensure that you run the site from the root directory, not the "test" directory. No database is required. Pre-configured php local servers are available for Windows and Mac. Here are some options:

To add a permanent copy destination, create a file in dist/ called ".destination.json". Inside the file, paste and customize the following:

{
"/Absolute/path/to/other/destination": true
}

Additionally, both methods can be combined.

Essential Git

As the source code is handled by the version control system Git, it's useful to know some features used.

cleaning

If you want to purge your working directory back to the status of upstream, following commands can be used (remember everything you've worked on is gone after these):

git reset --hard upstream/master
git clean -fdx

rebasing

For feature/topic branches, you should always use the --rebase flag to git pull, or if you are usually handling many temporary "to be in a github pull request" branches, run following to automate this:

git config branch.autosetuprebase local

(see man git-config for more information)

handling merge conflicts

If you're getting merge conflicts when merging, instead of editing the conflicted files manually, you can use the feature
git mergetool. Even though the default tool xxdiff looks awful/old, it's rather useful.

Add random number to url to stop caching

Load tests in an iframe

Loads a given page constructing a url with fileName: "./data/" + fileName + ".html"
and fires the given callback on jQuery ready (using the jQuery loading from that page)
and passes the iFrame's jQuery to the callback.

testIframe( fileName, testName, callback );

Callback arguments:

callback( jQueryFromIFrame, iFrameWindow, iFrameDocument );

Load tests in an iframe (window.iframeCallback)

Loads a given page constructing a url with fileName: "./data/" + fileName + ".html"
The given callback is fired when window.iframeCallback is called by the page
The arguments passed to the callback are the same as the
arguments passed to window.iframeCallback, whatever that may be